The Secret of a Child in Qotes

We find out that the mission can be completed at this point, which is good. She then ends up talking um after she visits the class room with gibson's son in qotes. It's not his actual, like mbiol a son, but it is a child that he has taken to raise as his son. And we'll find out whose kid it is later. But more importantly for me, why do think this man has identified himself as christopher columbus? I've no idea, honestly.